LGRED Installation Manual

77
Final Installation Procedures
Due to our policy of continuous product innovation, some specifications may change without notification.
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MULTI
F
MAX
MULTI
F
WITH
Refrigerant Charge
Multi F MAX with LGRED Systems
Outdoor Unit Model
Main Piping Length Branch Piping Length
Chargeless Pipe Length
of Main Pipe (L) (ft.)
Additional Charge
Needed (a) (oz./ft.)
Chargeless Pipe Length of
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Additional Charge
Needed (b) (oz./ft.)
LMU361HHV 49.2 0.54 131.2 0.22
LMU421HHV 49.2 0.54 131.2 0.22
LMU480HHV 49.2 0.54 131.2 0.22
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Additional charge (lbs.) = (Total Main Piping Length [A] - Chargeless Pipe Length of Main Pipe [L]) x a
+ (Total Installed Length of Branch [B1+B2+B3...] – Chargeless Branch Length [B]) x b
- CF (Correction Factor) x 3.53
• Number of installed length of branches depends on system specifications.
• CF = Maximum number of connectible indoor units – Total number of connected indoor units
Figure 99: Multi F MAX with LGRED Additional Refrigerant Charge Example.
FINAL INSTALLATION PROCEDURES
B3
18,000 9,000 9,000
LMU421HHV
• Total main pipe (A) = 90 ft.
• Each branch pipe
B1 =
B2 =
B3 =
B4 =
B5 =
Additional Charge
= (90 - 49.2) x 0.54
+ (116 - 131.2) x 0.22
– (6 - 5) x 3.53
= 15.16 oz.
A
49 ft.
17 ft.
17 ft.
10 ft.
23 ft.
BD Unit
BD Unit
9,000 18,000
A
A
B1 B2
B4 B5